Child components

components.child-machine\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class extends Component {
  get context() {
    return JSON.stringify(this.args.machine.machine.context)
  }
  
  @action
  updateContext() {
    this.args.machine
      .onTransition((state) => console.log('CHILD STATE: ', state))
      .send("UPDATE_CONTEXT")
  }
}

components.parent-machine\.js

import Component from '@glimmer/component';
import { matchesState, useMachine } from 'ember-statecharts';
import { createMachine, assign } from 'xstate'
import { action } from '@ember/object'
import { use } from 'ember-usable';

const childMachine = createMachine({
  id: "child-machine",
  initial: "idleChild",
  states: {
    idleChild: {
      on: {
        UPDATE_CONTEXT: {actions: ['updateContext']},
      }
    }
  }
}, 
{
  actions: {
  	updateContext: assign({prop1: 'new value'})
  }
});

const parentMachine = createMachine({
  id: "parent-state-machine",
  initial: "idle",
  states: {
    idle: {
      on: { INVOKE_CHILD: "withChildMachine" }
    },
    withChildMachine: {
      invoke: {
        id: "child-machine",
        src: childMachine,
        data: {
          prop1: "original value"
        }
      },
      on: {
        RESET: "idle"
      }
    }
  }
});


export default class extends Component {
  @matchesState('idle') isIdle;
  @matchesState('withChildMachine') isShowingChild;
  
  @use statechart = useMachine(parentMachine).onTransition((state) => console.log("PARENT STATE: ", state));

	get childMachine() {
    return this.statechart.state.children['child-machine'];
  }

	@action
  invokeChild() {
    this.statechart.send("INVOKE_CHILD")
  }

	@action
  reset() {
    this.statechart.send("RESET")
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

<ParentMachine />

<br>
<br>

templates.components.child-machine\.hbs

<h2>CHILD MACHINE</h2>

<div>
	{{this.context}}
</div>

<button {{on "click" this.updateContext}}>UPDATE CONTEXT WITH NEW VALUE</button>

templates.components.parent-machine\.hbs

<h1>Parent Machine</h1>


{{#if this.isIdle}}
  <button {{on "click" this.invokeChild }}>Press to invoke child machine</button>
{{else}}
  <button {{on "click" this.reset }}>Reset</button>
  <ChildMachine @machine={{this.childMachine}} />
{{/if}}

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-statecharts": "0.13.2"
  }
}